using System.Windows.Forms;
using System.Drawing;
using System.ComponentModel;

namespace Common
{
    public class Theme
    {
        public delegate void ApplyThemeHandler(Component component);
        public static event ApplyThemeHandler OnApplyTheme;
        public static Color ColorWindow;
        public static Color ColorWindowText;
        public static Color ColorControl;
        public static Color ColorControlText;
        public static Color ColorControlSelected;
        public static bool Used;
        private static string _name;
        public static string Name
        {
            get => _name;
            set
            {
                _name = value;
                switch (value)
                {
                    case "Dark":
                        ColorWindow = Color.FromArgb(0x20, 0x20, 0x20);
                        ColorWindowText = Color.White;
                        ColorControl = Color.FromArgb(0x40, 0x40, 0x40);
                        ColorControlText = Color.White;
                        ColorControlSelected = Color.FromArgb(255, 96, 125, 155);
                        break;
                    case "Light":
                        ColorWindow = Color.White;
                        ColorWindowText = Color.Black;
                        ColorControl = Color.FromArgb(0xe0, 0xe0, 0xe0);
                        ColorControlText = Color.Black;
                        ColorControlSelected = Color.FromArgb(255, 196, 225, 255);
                        break;
                    default:
                        _name = "System";
                        ColorWindow = Color.FromKnownColor(KnownColor.Window);
                        ColorWindowText = Color.FromKnownColor(KnownColor.WindowText);
                        ColorControl = Color.FromKnownColor(KnownColor.Control);
                        ColorControlText = Color.FromKnownColor(KnownColor.ControlText);
                        ColorControlSelected = Color.FromArgb(255, 196, 225, 255);
                        break;
                }
            }
        }

        static Theme()
        {
            Name = "System";
        }

        public static Color AdjustColor(Color color)
        {
            if (color == Color.White) color = ColorWindow;
            else if (color == Color.Black) color = ColorWindowText;
            else
            {
                if (Name == "Dark")
                {
                    // Exchange dark with light colors and vice versa
                    if (color == Color.DarkBlue) color = Color.LightBlue;
                    else if (color == Color.LightBlue) color = Color.DarkBlue;
                    else if (color == Color.DarkGreen) color = Color.LightGreen;
                    else if (color == Color.LightGreen) color = Color.DarkGreen;
                    else if (color == Color.DarkRed) color = Color.LightCoral;
                    else if (color == Color.LightCoral) color = Color.DarkRed;
                    else if (color == Color.PowderBlue) color = Color.Navy;
                    else if (color == Color.Navy) color = Color.PowderBlue;
                    else if (color == Color.LightCyan) color = Color.DarkCyan;
                    else if (color == Color.DarkCyan) color = Color.LightCyan;
                    else if (color == Color.Cyan) color = Color.Teal;
                    else if (color == Color.Teal) color = Color.Cyan;
                    else if (color == Color.Yellow) color = Color.Brown;
                    else if (color == Color.Brown) color = Color.Yellow;
                    else if (color == Color.LightGray) color = Color.DarkGray;
                    else if (color == Color.DarkGray) color = Color.LightGray;
                    else if (color == Color.Orchid) color = Color.DarkOrchid;
                    else if (color == Color.DarkOrchid) color = Color.Orchid;
                }
            }

            return color;
        }

        public static void ApplyTheme(Component component)
        {
            if (component is Control control)
            {
                foreach (Control child in control.Controls)
                {
                    ApplyTheme(child);
                }

                if ((control is TextBox) || (control is NumericUpDown) || (control is ComboBox) || (control is RichTextBox)
                    || (control is ListView))
                {
                    control.BackColor = ColorWindow;
                    control.ForeColor = ColorWindowText;
                }
                else
                {
                    control.BackColor = ColorControl;
                    control.ForeColor = ColorControlText;
                }
                if (control.ContextMenuStrip != null)
                {
                    ApplyTheme(control.ContextMenuStrip);
                }
            }

            if (component is SplitButton splitButton)
            {
                ApplyTheme(splitButton.Menu);
            }
            if ((component is Button button) && (Name == "System"))
            {
                button.UseVisualStyleBackColor = true;
            } else
            if (component is LinkLabel linkLabel)
            {
                linkLabel.LinkColor = ColorControlText;
                linkLabel.ActiveLinkColor = ColorControlText;
                linkLabel.VisitedLinkColor = ColorControlText;
            } else
            if (component is TabControl tabControl)
            {
                foreach (TabPage tabPage in tabControl.TabPages)
                {
                    ApplyTheme(tabPage);
                }
            } else
            if (component is ToolStrip toolStrip)
            {
                toolStrip.RenderMode = ToolStripRenderMode.Professional;
                toolStrip.Renderer = new ToolStripProfessionalRenderer(new ThemeColorTable());
                foreach (ToolStripItem item in toolStrip.Items)
                {
                    if (item is ToolStripMenuItem toolStripMenuItem)
                    {
                        if (toolStripMenuItem.DropDownItems.Count > 0)
                        {
                            foreach (ToolStripItem dropDownItem in toolStripMenuItem.DropDownItems)
                            {
                                ApplyTheme(dropDownItem);
                            }
                        }
                    }
                    ApplyTheme(item);
                }
            } else
            if (component is ToolStripItem toolStripItem)
            {
                toolStripItem.ForeColor = ColorControlText;
                toolStripItem.BackColor = ColorControl;
                if (toolStripItem is ToolStripMenuItem toolStripMenuItem)
                {
                    if (toolStripMenuItem.DropDownItems.Count > 0)
                    {
                        foreach (ToolStripItem dropDownItem in toolStripMenuItem.DropDownItems)
                        {
                            ApplyTheme(dropDownItem);
                        }
                    }
                }
            } else
            if (component is DataGridView dataGridView)
            {
                dataGridView.BackgroundColor = ColorWindow;
                dataGridView.DefaultCellStyle.BackColor = ColorWindow;
                dataGridView.DefaultCellStyle.ForeColor = ColorWindowText;
                dataGridView.ColumnHeadersDefaultCellStyle.BackColor = ColorWindow;
                dataGridView.ColumnHeadersDefaultCellStyle.ForeColor = ColorWindowText;
            } else
            if (component is RichTextBox richTextBox)
            {
                richTextBox.SelectAll();
                richTextBox.SelectionColor = ColorWindowText;
                richTextBox.SelectionLength = 0;
            } else
            {
                OnApplyTheme?.Invoke(component);
            }
        }

        public static void UseTheme(Form form)
        {
            if (!Used && (_name == "System")) return;
            ApplyTheme(form);
            Used = true;
        }
    }

    public class ThemeColorTable : ProfessionalColorTable
    {
        public override Color MenuStripGradientBegin => Theme.ColorControl;
        public override Color MenuStripGradientEnd => Theme.ColorControl;
        public override Color ToolStripContentPanelGradientBegin => Theme.ColorControl;
        public override Color ToolStripContentPanelGradientEnd => Theme.ColorControl;
        public override Color ToolStripDropDownBackground => Theme.ColorControl;
        public override Color ToolStripGradientBegin => Theme.ColorControl;
        public override Color ToolStripGradientMiddle => Theme.ColorControl;
        public override Color ToolStripGradientEnd => Theme.ColorControl;
        public override Color MenuItemSelected => Theme.ColorControlSelected;
        public override Color MenuItemSelectedGradientBegin => Theme.ColorControlSelected;
        public override Color MenuItemSelectedGradientEnd => Theme.ColorControlSelected;
        public override Color ImageMarginGradientBegin => Theme.ColorControl;
        public override Color ImageMarginGradientMiddle => Theme.ColorControl;
        public override Color ImageMarginGradientEnd => Theme.ColorControl;
        public override Color MenuItemPressedGradientBegin => Theme.ColorControlSelected;
        public override Color MenuItemPressedGradientMiddle => Theme.ColorControlSelected;
        public override Color MenuItemPressedGradientEnd => Theme.ColorControlSelected;
    }
}